Fuse.



V. G. .IENSENr y Fuss. APPLICATION FILED SEPT. 18. I9l6.

1,266,479. l P Patented My14,1918, y

vieron G. JENSEN, or cH,i:cAeo,'rLLri\iois; Y

To aZZ inkom t'may conce-rn: I

. Be it known that I, VICTOR G. Jensen, a citizen of the Unitedl Statesyand aresi-y dent of the city of Chicago, inthe county of vCook and State of Illinois, have invented certain new and useful' Improvements iii-- Fuses; and I d0 hereby declare that the following is a full, clear, and exact description' rf the same, reference beingv had to the accompanying drawings, Aand to the numerals of reference marked thereon, which forni a part of this specification.

Inclosed or cartridge fusesv usually con-` sist of a fusible strip or wire -placed-v within a tubular inclosing jacket filled Vwith porous, powdered or other4 insulating material througlrwhich thefuse wiie is suspended from end to end surrounded by said insulating-material. The wire, tube and insulating material are made into one complete or uni-- tary, self-contained. device with brass or vcopper ferrules at eachfend to which thefuse`wire is soldered. l/Vhen this type of cartridge fuse blows, by V'excessive current or a short circuit the gases resulting are either v taken up by the insulating filling of the tube, or escape through an opening in theside of the tube.- In both of these cases the com-v plete fuse must be removed fromthe circuit and replaced.

This invention relates to an improved vtype of cartridge fuse comprising recessed insulating members adapted to be removably -clam'ped together by end ferrules tdretain a fusible strip therebetween passingy through said recessed portions and with the end ferrules .formed to contact the ends of said fusible strip and acting` as terminal Contact Y means to' connect the fuse in circuit.l Said fuse is constructed to permit the replacement of the fusible strip after the same has blown, or the replacement of any of the other parts 'of the fuse..

ing parts of-the fuse.

It is also an important object of thisA iiiveiition to provide a cartridgefuse wherein 4the fusible strip is removably clamped between insulating members which are in turn clamped together at their ends by metal ferl specification of Letters Parent..

rules 'constructed to contact said fusible strip and act'ijiig'as 4Contact terminals for connectingtheffiisein'a-circuitl Itisa further object of this invention to constructv a cartridge fuse wherein semicylindrical insulating members are recessed to receive an irregularly shaped fusible strip and to afford a blowing or explosion chainber, said members being formed to receive ferrule's on the ends-thereof 'to releasably clamp the ,same together and Contact the ends of saidv fusible strip.

It is finally an ob'ect of this invention to -provide an inclosed or cartridge fuse adapted to receive the fusible strip of only one particular size or capacity, saidfusible strip or any of the parts of said .fuse being so formed tliatitheymay be removedl or r`e-, placed. The invention (in a preferred forni) is illustrated in the drawings and hereinafter more fully described.

ln the drawings:

Figure l, `is a side elevational view of a cartridge fuse embodyingA the'prineiples of my invention.

FigQ2, is a cross-section taken on line .h-2, of Fig. l. 4

Fig. 3, is a section taken on line l-vgrfof Fig. 2, with parts shown in elevation. y

Fig. 4, is an inside View of one 'of the in sulating members of the device 'having fusible strip removably embedded thereiili.

The main body of the cartridge fuse comprises semi-cylindrical solid insulating mein-l bers l and 2, having centrally formed or cut inthe inner face thereof recesses 8 and 4, respectively adapted when said insulating .members are placed face to face to register with one another to form a fusing or ein 1 plosion chamber as clearly shown in Figs. 2 and 3. Each of said insulating members l and 2, has integrally formed along one side of the inner face thereof a rib 5, and along the opposite side parallel t0 lsaid rib a groove (3` complementalgin shape to said rib. The rib of one member is adapted to nt into the groove of the otherto prevent a lateral movement and hold'said members alined. The' outer surface at one end of each 'of said in- .,sulating members is provided with 'threads cut away to reduce the thickness thereof, as

the entire -length of said member,

indicated by the reference numeral 9. Cut

or formed longitudinally in the inner face.

of the insulatingimember 1, and communicating withthe recess 3, is an irregularly shaped or zigzag groove extending througl an adapted to receive seated therein, iiush with the inner surface thereof, a attened fusible strip or wire 10, also zigzag in shape the centralpart at the point 11, passing through the recess 3. Said fusible strip 10, has in tegrally formed`enY each end thereof an enlarged rounded portion Having a slit m therein to afford contact members or tongues 13,'adapted to be bent in opposite directions from one another iiat over the respective ends of said insulating members, as shown in Figs. 3 and 5.

To removably hold the insulating members 1 and 2, together with the fusible strip l0, therebetween, the reduced ends 9,V are Abrought together while the opposite ends are spread apart to-permit a metallic ferrule or cap 14, having a circumferential bead or rib 15, integrally formed on the inner periphery thereof, to slip or engage over the reduced ends 9, with the bead 15, tting into the grooves 8. In order to form a suitable connection between the tongues 13, and the ferrule 14, a convex star shaped metallic spring or convex connecting spider 16, is mounted in said ferrule with the convex surface thereof bearing against the tongues 13.

The threaded end of said insulating members 1 and 2, are now brought together forcing the sides of the reduced ends 9, tightly against lthe inner surface of said ferrule 14, with the bead 15, engaging the grooves 8, and forcing the resilient spring 16, tightly against the tongues 13, thus insuring a good electrical contact and also preventing the removal of the ferrule 14. To clamp the threaded endsof said members 1 and 2, together an internally'threaded metallic ferrule or cap 17 is removably engaged over the threads 7. Integrally formed on `the inner surface of the base of said ferrule 17 are a pluralityl of concentric knife edge ridges 18, adapted to tightly contact or cut into the tongues 13, to form a good contact as the ferrule l17 is threaded into said4 insulating member. To permit the cartridge fuse to be detachably connected in a suitable support in a circuit, each of said ferrulesfv 14 and 17 has integrally formed thereon an outwardly projecting lug 19.

The operation is as follows:

In assembling the cartridge fuse a zigzag fusible strip 10, of the required ampere capacity is placed in the zigzag groove 1n the insulating member 1, said groove being so shaped as to-receive only a certain fusible strip of a rated capacity and shape to prevent fusing strips of either a larger or smaller capacity being used, thereby causing improper fusing of the circuit in which the cartridge fuse is to be used. With the fusing strip seated in said 'member 1, the in? sulating member 2, is placed thereagainst with the recesses 3 and 4, registering with one another'to form a fuse blowing chamber, having the central portion 11, of, the fusible strip 10, passing therethrough. The reduced ends 9,' of said members 1 and 2, are now brought together to permit the ferrule 14, to-be inserted over said ends, with the bead 15, engaging in the grooves 8,.and

,with the cdnyezr spring contact member 16,

.pressing'against the bent over tongues 13. The threaded ends 7, of said members are now pressed together thus forcing .the reduced ends 9, outwardly against the inner surface of said ferrule and also forcing the tongues 13, tightly against the spring 16, to insure a good contact. 1n this position the rib 5, and groove 6, of the insulating member 1, Iit into the respective groove and rib of said member 2, to hold said members alined and prevent any lateral movement therebetween. The ferrule 17, is now threadedonto the threaded ends 7, of said member-s, the knife edge ridges 18, of said cap pressing or cutting into the tongues 13,` rigidly holding the same against the ends of said members and producing a. good ,contact between the cap 17 and the fusible strip 10. The cartridge fuse may now be mounted in a suitable fuse support adapted to receive the lugs 19, whereby the fuse is connected in circuit.

1f the circuit is subjected to an excessive current or a short circuit, the fusible strip 10, will blow` in the explosion chamber formed by the Irecesses 3 and 4, said chamber retaining the gases resulting from the blowing of the fusing strip.V The ferrules 17 and 14, may now be removed and the insulating members 1 and4 2, separated and cleaned, removing the blown fusing strip 10, and replacing` the same by another fus- ,ing strip of the same capacity, thus permitting the reuse of the other parts of the cartridge fuse, any of which may of course be replaced if they become defective.

l am aware that various details of construction may be varied through a wide range without departing from the principles of this invention, and 1' therefore do not purpose limiting the patent granted otherwise than necessitated by the prior art.

I claim as my invention: i

1. In a cartridge fuse of the class dei to Contact one end of Said fusing strip, a-

second ferrule, concentric ridges integrally formed therein, said second ferrule adapted to engage over the other end of said insulating means with said ridges contacting-'the other end of said fusing strip, and means on said ferrules for mounting the inclosed fuse.

scribed, an irregularly shaped fusing strip of a 'given current capacity, recessed insulating members irregularly grooved to removably receive said fusing strip, each of said members cut away and having a groove at one end thereof and threads at the other end, a cap, a bead integrally formed therein, a spring in said cap, said cap adapted 3. In a cartridge fuse of the class de-j to engage over the grooved ends of Said members when the cut away ends are brought together with said bead fitting into said grooves and withsaid spring contacting one end of said fusing strip, an internally threaded cap, ridges integrally formed therein, said Cap adapted to be threaded over the threaded ends of said members with said ridges contacting the other end of said fusing strip, and means integrally formed on said caps for mountmg the cartridge fuse.

et. A fuse comprising interitting insulating members threaded at one endV and shaped. at their opposite ends to receive a cap thereon, a fuse strip between said members having the ends bent over the ends of said members, a cap threaded on the thread- I ed end of the insulating members firmly clamping the end of the fuse in place, a capy on the opposite end of the members complementally formed to receive saidv end therein, and a tension member in the cap bearing on the end of the fuse.

In testimony whereof I have hereunto subscribed my name in the subscribmg witnesses.

vieron Gf JENSEN.

presence of two Witnesses: 'I

CHARLES W. HILLS, EARL M. HARDINE. 

